I've been trying to make a simple bass in both Operator and Analog, and for some reason, both are clicking hysterically on my current midi arrangement.
I spent the last hour messing with the ASDRb (I immediately assumed it was the attack), glide, length of the midi notes on the grid, phase, and still no luck. It is an extremely simple midi arrangement as well. I've also tried different buffer sizes, and it still happens at the highest setting. I'm on a Macbook Pro with 16g of RAM and a fast CPU. I'm on the latest build of Live Suite (9.7.1).

To make sure I wasn't going insane, I threw in Serum, and BOOM. No clicking! Only when I put the attack crazy low (sub 20ms), did it click.

Great question. I just tried a bunch of bass presets and pretty much all of them clicked, with the exception of Hip-Hop Sub Bass. That was clean! Once I started raising the release on it however (from 0 to about 25ms, via the macro), it started clicking again. THEN... I put it back on 0 so it didn't click, and turned off the EQ8 that's on the preset. BOOM... clicking again.

Thinking that was somehow the issue, I took that exact EQ8 and put it on my default preset of Operator... the clicking was back. Confused as ever.

On Operator activate the R buttons on the oscillators, and make sure all the phases are 0.
In the main section set the R (retrigger) on also
a waveform starting at a non-zero position is a click.

If the bass patch isn't polyphonic - on the pitch tab activate the glide and set it to the lowest value.
a new note starting part-way though an old note will cause an abrupt transition in phase and cause a click. glide helps resolve that.

Angstrom: Thanks for the pointers. I went through all those steps and the problem still persists. I tried playing with the phase settings, toggled the re-triggers, turned on glide and set it to .10ms (tried higher values), made sure it was only using 1 voice, etc. Same problem... so weird.

if the notes are consecutive maybe the release is being abruptly cut off by the next note triggering. I'm not really sure
i just always leave a small gap between notes now and no clicks
sample with operator 1 sine voices changed to 1 no asdr adjustedhttps://soundcloud.com/dubxile/sine-bass-click-sample
first loop gap between notes second loop notes begin and end on the grid